The ACS switches from mode 7 to mode 3 when mode 7 is not able to maintain a small elevationerror while dealing with the azimuth error at the same time.
当模式7在处理方位角错误时无法同时维持较小的仰角错误时，ACS会从模式7转换成模式3。
2
At this point, the satellite is in its final configuration and it will reach its final attitude by correcting the azimuth error as well as the elevationerror.
在这个时机点，卫星已经进入最后的设定并且会透过修正方位角错误和仰角错误来达到最后的姿态。
3
The refraction effect on positioning of the over-the-horizon radar signal is analyzed. The charts of the refractive error(elevationerror and range error) are also given.